GB/T 22459.7-2019Refractory mortars—Part 7: Determination of other properties (English PDF)

Foreword

GB/T 22459 "Refractory Mud" consists of 8 parts.

--- Part 1. Consistency test method (cone penetration method);

--- Part 2. Consistency test method (skip table method);

--- Part 3. Bonding time test method;

---Part 4. Test method for normal temperature flexural bond strength;

---Part 5. Particle size distribution (screen analysis) test method;

---Part 6. Test method for premixed mud water content;

--- Part 7. Other performance test methods;

--- Part 8. Test methods for bleeding.

This part is part 7 of GB/T 22459.

This part is drafted in accordance with the rules given in GB/T 1.1-2009.

This part replaces GB/T 22459.7-2008 "Refractory Mud Part 7: Test Method for High Temperature Performance". versus Compared with GB/T 22459.7-2008, the main technical changes are as follows.

--- Revised scope (see Chapter 1, Chapter 1 of the 2008 edition);

--- Revised the normative reference document (see Chapter 2, Chapter 2 of the 2008 edition);

---Modified equipment (see Chapter 3, Chapter 3 of the 2008 edition);

--- Modified the sampling method (see Chapter 4, Chapter 4 of the 2008 edition);

--- Revised the treatment method of pre-mixed mud in the test method of refractoriness (see 5.2, 5.2 of 2008 edition);

--- Removed the line rate test method (see Chapter 7 of the 2008 edition);

--- Increased the normal temperature flexural strength test method (see Chapter 7);

---Modified the treatment method of pre-mixed mud in the thermal expansion test method (see 8.3, 8.2 of 2008 edition);

--- Removed the load softening temperature test method (see Chapter 9 of the 2008 edition);

--- Increased thermal conductivity test method (see Chapter 9).

1 Scope

This part of GB/T 22459 specifies the refractoriness of refractory mud, high temperature flexural bond strength, room temperature flexural strength, thermal expansion rate, and guidance. Test method such as thermal coefficient. This section applies to refractory mud for industrial furnaces.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 3001 refractory material normal temperature flexural strength test method

GB/T 3002 refractory high temperature flexural strength test method

GB/T 4513.2 Unshaped refractories - Part 2: Sampling

GB/T 7320 refractory thermal expansion test method

GB/T 7322 refractory test method for refractory

GB/T 22459.1 Refractory mud - Part 1 - Test method for consistency (cone penetration method)

GB/T 22459.2 Refractory mud - Part 2: Test method for consistency (skip table method)

GB/T 22459.4 Refractory mud - Part 4: Test method for resistance to bond strength at normal temperature

GB/T 22588 flash method for measuring thermal diffusivity or thermal conductivity

YB/T 4130 Refractory thermal conductivity test method (water flow plate method)

3 Instruments

3.1 Mixer. Use the mixer specified in GB/T 22459.1 or GB/T 22459.2.

3.2 Drying box. It can meet the temperature control of (65±5) °C and (110±5) °C.

3.3 Consistency tester. Use the consistency tester specified in GB/T 22459.1 or GB/T 22459.2.

3.4 Balance. The range is 2000g and the graduation value is 1g.

3.5 Filter paper.

3.6 Tamping rod. steel, the radius of curvature of the head is about 5mm.

4 Sampling

Dry powder slurry, sampled according to GB/T 4513.2 or negotiated by both parties. Sampling with a quartering or divider.

To pre-stir the mud, pour all the mud in the packaging container into a larger capacity container and mix well before sampling.

5 Fire resistance test

5.1 Dry powder mud, measure the degree of refractoriness according to the provisions of GB/T 7322.